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Product name : Tetraiodothyronine ,T4, L-Thyroxine ,Levothyroxine
Alias: L-Thyroxine,3,3′,5,5′-Tetraiodo-L-thyronine,3-[4-(4-Hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl]-L-alanine
CAS: 51-48-9
Einecs: 200-101-1
MF: C15H11I4NO4
MW: 776.87
Purity: 99.3% min
Appearance: White Crystalline Solid
Grade : Pharmaceutical Grade
Storage: Shading, confined preservation

T4, also known as L-thyroxine and Levothyroxine , is a synthetic thyroid hormone that is chemically identical to thyroxine (T4), which is naturally secreted by the follicular cells of the thyroid gland. It is used to treat thyroid hormone deficiency, and occasionally to prevent the recurrence of thyroid cancer. Like its naturally secreted counterpart, levothyroxine is a chiral compound in the L-form.

T4 is a replacement for a hormone normally produced by your thyroid gland to regulate the body's energy and metabolism. Levothyroxine is given when the thyroid does not produce enough of this hormone on its own.

T4 treats hypothyroidism (low thyroid hormone). It is also used to treat or prevent goiter (enlarged thyroid gland), which can be caused by hormone imbalances, radiation treatment, surgery, or cancer.

T4 is used to treat an underactive thyroid (hypothyroidism). It replaces or provides more thyroid hormone, which is normally produced by the thyroid gland. Low thyroid hormone levels can occur naturally or when the thyroid gland is injured byradiation/medications or removed by surgery. Having enough thyroid hormone is important for maintaining normal mental and physical activity. In children, having enough thyroid hormone is important for normal mental and physical development.

This medication is also used to treat other types of thyroid disorders (such as certain types of goiters, thyroid cancer).

One of the thyroid hormones involved in the maintenance of metabolic homeostasis. Synthesized and stored as amino acid residues of thyroglobulin, the major protein component of the thyroid follicular colloid. Synthesis and secretion are regulated by the people.

This medication should not be used to treat infertility unless it is caused by low thyroid hormone levels.

Product name L-Thyroxine
Appearance White crystalline powder
Assay(*) 98~101.0% 99.3%
Identification By UV, To match with working standard Complies
Related Substances Not more than the reference solution (0.05%) Complies
Heavy metals <10ppm 10ppm
Loss on drying <0.5% 0.15%
Resiue on ignition <0.1% 0.05%
Melting 235℃ Complies

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